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<meta name="description" content="简单阐述: TCP BBR 致力于解决两个问题： 在有一定丢包率的网络链路上充分利用带宽。非常适合高延迟、高带宽的网络链路。 降低网络链路上的 buffer 占用率，从而降低延迟。非常适合慢速接入网络的用户。   测试目的:这次的测试主要是针对丢包率.更有说服力的测试请参考Lawrence Brakmo的BBR Report. BBR的另一面  测试准备： ADDR01：aaa.aaa.aaa.a">
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                Linode的BBR简单测试
              
            
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        <h1 id="简单阐述"><a href="#简单阐述" class="headerlink" title="简单阐述:"></a>简单阐述:</h1><ul>
<li><h2 id="TCP-BBR-致力于解决两个问题："><a href="#TCP-BBR-致力于解决两个问题：" class="headerlink" title="TCP BBR 致力于解决两个问题："></a>TCP BBR 致力于解决两个问题：</h2><ul>
<li>在有一定丢包率的网络链路上充分利用带宽。非常适合高延迟、高带宽的网络链路。</li>
<li>降低网络链路上的 buffer 占用率，从而降低延迟。非常适合慢速接入网络的用户。</li>
</ul>
</li>
<li><h2 id="测试目的"><a href="#测试目的" class="headerlink" title="测试目的:"></a>测试目的:</h2>这次的测试主要是针对丢包率.更有说服力的测试请参考<a href="https://drive.google.com/file/d/0B4YZ_0yTgbJEa21CbUVLWFdrX2c/view" target="_blank" rel="external">Lawrence Brakmo的BBR Report</a>.</li>
<li><h2 id="BBR的另一面"><a href="#BBR的另一面" class="headerlink" title="BBR的另一面"></a><a href="http://blog.csdn.net/dog250/article/details/54754784" target="_blank" rel="external">BBR的另一面</a></h2></li>
</ul>
<h1 id="测试准备："><a href="#测试准备：" class="headerlink" title="测试准备："></a>测试准备：</h1><ul>
<li><h2 id="ADDR01：aaa-aaa-aaa-aaa"><a href="#ADDR01：aaa-aaa-aaa-aaa" class="headerlink" title="ADDR01：aaa.aaa.aaa.aaa"></a>ADDR01：aaa.aaa.aaa.aaa</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">$ uname -r</div><div class="line">4.8.6-x86_64-linode78</div></pre></td></tr></table></figure>
</li>
<li><h2 id="ADDR02：bbb-bbb-bbb-bbb"><a href="#ADDR02：bbb-bbb-bbb-bbb" class="headerlink" title="ADDR02：bbb.bbb.bbb.bbb"></a>ADDR02：bbb.bbb.bbb.bbb</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"># uname -r</div><div class="line">4.8.6-x86_64-linode78</div></pre></td></tr></table></figure>
</li>
</ul>
<hr>
<h1 id="测试方式："><a href="#测试方式：" class="headerlink" title="测试方式："></a>测试方式：</h1><ul>
<li><h2 id="模拟丢包1-30-的场景，分别测试不同内核开启BBR先后的情况。"><a href="#模拟丢包1-30-的场景，分别测试不同内核开启BBR先后的情况。" class="headerlink" title="模拟丢包1%-30%的场景，分别测试不同内核开启BBR先后的情况。"></a>模拟丢包1%-30%的场景，分别测试不同内核开启BBR先后的情况。</h2><p>用到的tc指令：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line"># 清理tc规则：</div><div class="line">tc qdisc del root dev eth0</div><div class="line"># 模拟1%丢包：</div><div class="line">tc qdisc add dev eth0 root netem loss 1%</div><div class="line"># 模拟10%丢包：</div><div class="line">tc qdisc add dev eth0 root netem loss 10%</div><div class="line"># 模拟30%丢包：</div><div class="line">tc qdisc add dev eth0 root netem loss 30%</div></pre></td></tr></table></figure>
</li>
<li><h2 id="测试从从ADDR02传数据到ADDR01-ADDR01的内核不变-ADDR02在每次测试都会调整内核重启。"><a href="#测试从从ADDR02传数据到ADDR01-ADDR01的内核不变-ADDR02在每次测试都会调整内核重启。" class="headerlink" title="测试从从ADDR02传数据到ADDR01,ADDR01的内核不变,ADDR02在每次测试都会调整内核重启。"></a>测试从从ADDR02传数据到ADDR01,ADDR01的内核不变,ADDR02在每次测试都会调整内核重启。</h2></li>
</ul>
<h1 id="测试过程："><a href="#测试过程：" class="headerlink" title="测试过程："></a>测试过程：</h1><ul>
<li><h2 id="步骤略-test-gz约160MB-过程大致如下"><a href="#步骤略-test-gz约160MB-过程大致如下" class="headerlink" title="步骤略,test.gz约160MB,过程大致如下:"></a>步骤略,test.gz约160MB,过程大致如下:</h2><p>没有启用BBR的情况，从ADDR02传数据到ADDR01：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line">$ rsync -ave &quot;ssh -l mickey&quot;  --progress test.gz mickey@bbb.bbb.bbb.bbb:/home/mickey/test.gz</div><div class="line">sending incremental file list</div><div class="line">test.gz</div><div class="line">   166042909 100%    3.27MB/s    0:00:48 (xfer#1, to-check=0/1)</div><div class="line">sent 166063274 bytes  received 31 bytes  3288382.28 bytes/sec</div><div class="line">total size is 166042909  speedup is 1.00</div></pre></td></tr></table></figure>
</li>
<li><h2 id="测试数据比对"><a href="#测试数据比对" class="headerlink" title="测试数据比对:"></a>测试数据比对:</h2></li>
</ul>
<table>
<thead>
<tr>
<th style="text-align:center"></th>
<th style="text-align:center">4.8.6-x86_64-linode78</th>
<th style="text-align:center">4.9.15-x86_64-linode78</th>
<th style="text-align:center">非linode的官方4.10内核(generic)</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:center">没有启动BBR正常情况</td>
<td style="text-align:center">3.27MB/s</td>
<td style="text-align:center">3.36MB/s</td>
<td style="text-align:center">没有测试</td>
</tr>
<tr>
<td style="text-align:center">启动BBR正常情况</td>
<td style="text-align:center">没有测试</td>
<td style="text-align:center">3.45MB/s</td>
<td style="text-align:center">2.31MB/s</td>
</tr>
<tr>
<td style="text-align:center">启动BBR丢包1%</td>
<td style="text-align:center">3.19MB/s</td>
<td style="text-align:center">没有测试</td>
<td style="text-align:center">没有测试</td>
</tr>
<tr>
<td style="text-align:center">启动BBR丢包10%</td>
<td style="text-align:center">没有测试</td>
<td style="text-align:center">3.21MB/s</td>
<td style="text-align:center">2.81MB/s</td>
</tr>
<tr>
<td style="text-align:center">启动BBR丢包30%</td>
<td style="text-align:center">97.30kB/s(在20分钟内没有传输完成中断得到的最后结果)</td>
<td style="text-align:center">1.35MB/s</td>
<td style="text-align:center">1.15MB/s</td>
</tr>
</tbody>
</table>
<ul>
<li><h2 id="测试总结和当时情况-以上述结果来总结"><a href="#测试总结和当时情况-以上述结果来总结" class="headerlink" title="测试总结和当时情况(以上述结果来总结):"></a>测试总结和当时情况(以上述结果来总结):</h2><ul>
<li>linode自己编译的内核有明显针对性优化,效果比较明显.</li>
<li>启动bbr后在丢包30%的情况下还能完成传输,bbr的效果也比较明显;</li>
<li>4.10内核选择了generic没有选择lowlatency.</li>
<li>本来还打算测50%的丢包.但是50%设置后几乎无法远程操作ADDR01而放弃测试.</li>
</ul>
</li>
</ul>
<hr>
<h1 id="附录："><a href="#附录：" class="headerlink" title="附录："></a>附录：</h1><ul>
<li><h2 id="centos7官方内核的升级方法："><a href="#centos7官方内核的升级方法：" class="headerlink" title="centos7官方内核的升级方法："></a>centos7官方内核的升级方法：</h2><ul>
<li><p>升级内核:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org</div><div class="line">rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm</div><div class="line">yum --enablerepo=elrepo-kernel install kernel-ml -y</div></pre></td></tr></table></figure>
</li>
<li><p>更新启动</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \&apos;</div><div class="line">grub2-set-default 0  #default 0表示第一个内核设置为默认运行, 选择最新内核就对了</div><div class="line">reboot</div></pre></td></tr></table></figure>
</li>
<li><p>开启BBR：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line">modprobe tcp_bbr</div><div class="line">echo &quot;net.core.default_qdisc=fq&quot; &gt;&gt; /etc/sysctl.conf</div><div class="line">echo &quot;net.ipv4.tcp_congestion_control=bbr&quot; &gt;&gt; /etc/sysctl.conf</div><div class="line">sysctl -p</div></pre></td></tr></table></figure>
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#简单阐述"><span class="nav-number">1.</span> <span class="nav-text">简单阐述:</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#TCP-BBR-致力于解决两个问题："><span class="nav-number">1.1.</span> <span class="nav-text">TCP BBR 致力于解决两个问题：</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#测试目的"><span class="nav-number">1.2.</span> <span class="nav-text">测试目的:</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#BBR的另一面"><span class="nav-number">1.3.</span> <span class="nav-text">BBR的另一面</span></a></li></ol></li><li class="nav-item nav-level-1"><a class="nav-link" href="#测试准备："><span class="nav-number">2.</span> <span class="nav-text">测试准备：</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#ADDR01：aaa-aaa-aaa-aaa"><span class="nav-number">2.1.</span> <span class="nav-text">ADDR01：aaa.aaa.aaa.aaa</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#ADDR02：bbb-bbb-bbb-bbb"><span class="nav-number">2.2.</span> <span class="nav-text">ADDR02：bbb.bbb.bbb.bbb</span></a></li></ol></li><li class="nav-item nav-level-1"><a class="nav-link" href="#测试方式："><span class="nav-number">3.</span> <span class="nav-text">测试方式：</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#模拟丢包1-30-的场景，分别测试不同内核开启BBR先后的情况。"><span class="nav-number">3.1.</span> <span class="nav-text">模拟丢包1%-30%的场景，分别测试不同内核开启BBR先后的情况。</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#测试从从ADDR02传数据到ADDR01-ADDR01的内核不变-ADDR02在每次测试都会调整内核重启。"><span class="nav-number">3.2.</span> <span class="nav-text">测试从从ADDR02传数据到ADDR01,ADDR01的内核不变,ADDR02在每次测试都会调整内核重启。</span></a></li></ol></li><li class="nav-item nav-level-1"><a class="nav-link" href="#测试过程："><span class="nav-number">4.</span> <span class="nav-text">测试过程：</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#步骤略-test-gz约160MB-过程大致如下"><span class="nav-number">4.1.</span> <span class="nav-text">步骤略,test.gz约160MB,过程大致如下:</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#测试数据比对"><span class="nav-number">4.2.</span> <span class="nav-text">测试数据比对:</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#测试总结和当时情况-以上述结果来总结"><span class="nav-number">4.3.</span> <span class="nav-text">测试总结和当时情况(以上述结果来总结):</span></a></li></ol></li><li class="nav-item nav-level-1"><a class="nav-link" href="#附录："><span class="nav-number">5.</span> <span class="nav-text">附录：</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#centos7官方内核的升级方法："><span class="nav-number">5.1.</span> <span class="nav-text">centos7官方内核的升级方法：</span></a></li></ol></li></ol></div>
            

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